People give flowers on many occasions in Germany. Although ______ sell flowers wrapped in paper or plastic, their customers always unwrap the flowers before giving them to others. A ______ should always have an uneven number of flowers, but never 13 flowers, since the number 13 ______ bad luck. Avoid giving red roses, which are given to sweethearts and are only approproate for ______ occasions. Calla lilies are also a poor choice for a gift because they are used for ______ . Heather is another flower that has ______ with death. In Northern Germany, it is often planted on graves, and it is considered bad luck to bring it into a house.